21418026 has 32 divisors (see below), whose sum is σ = 49440768. Its totient is φ = 6058800.

The previous prime is 21418013. The next prime is 21418027. The reversal of 21418026 is 62081412.

It is a junction number, because it is equal to n+sod(n) for n = 21417987 and 21418005.

It is not an unprimeable number, because it can be changed into a prime (21418027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1851 + ... + 6801.

It is an arithmetic number, because the mean of its divisors is an integer number (1545024).

Almost surely, 2^21418026 is an apocalyptic number.

21418026 is an abundant number, since it is smaller than the sum of its proper divisors (28022742).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21418026 is a wasteful number, since it uses less digits than its factorization.

21418026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5066.

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 21418026 is about 4627.9613222239. The cubic root of 21418026 is about 277.7110414730.

Adding to 21418026 its reverse (62081412), we get a palindrome (83499438).

The spelling of 21418026 in words is "twenty-one million, four hundred eighteen thousand, twenty-six".